Hold-down dog



Nov. 23, 1943. J. L. DRAKE HOLD-DOWN DOG Filed Feb. .9, 1942 2 Sheets-Sheet 1 QM W mma:

Patented Nov. 23, 1943 uiNirEn STATES PATENT OFFICE John L. Drake','Muskegon, Mich., assignor to Ray W. Asbury, Grand Haven, Mich.

Application February 19, 1942, Serial No. 431,567.

4 Claims. (CI. 9059) The present invention relates to new and useful improvements in hold-down dogs for metal working machines, and has for one of its important objects to provide, in a manner as hereinafter set forth, a device of this character which may be expeditiously engaged with the work and which will firmly secure said work in any desired position.

Another very important object of the invention is to provide a hold-down dog of the aforementioned character which is adapted to be conveniently adjusted to meet various conditions.

Other objects of the invention are to provide a hold-down dog of the character described which will be comparatively simple in construction,

strong, durable, highly efficient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in front elevation of a holddown dog constructed in accordance with the present invention, showing the device in use.

Figure 2 is a fragmentary view in top plan.

Figure 3 is a cross-sectional view, taken substantially on the line 3-3 of Figure 1.

Figure 4 is a vertical sectional view through one of the jaws, taken substantially on the line 44 of Figure 2.

Figure 5 is a vertical sectional view through one of the screw jacks or braces, taken substantially on the line 55 of Figure 2.

Figure 6 is a detail view in perspective of one of the posts.

Referring now to the drawings in detail, it will be seen that reference numeral l designates an elongated machine table. The table i has formed longitudinally in its upper surface aplurality of spaced, parallel, substantially T-shaped grooves 2. The upper surface of the table I is further.

provided with a plurality of sockets 3. The purpose of the grooves 2 and the sockets 3 will be presently set forth. A piece of work on the table I is indicated at 4.

Rising from the table I is a plurality of removable and slidably adjustable threaded posts 5. The posts 5 are provided with heads 6 on their lower ends which are operable in the substantially T-shaped grooves 2 in the table I. Thus, the posts 5 are anchored to the table I.

Mounted for sliding and rotary adjustment on the posts 5 are jaws I inthe form of blocks of steel or other suitable metal. The fronts of the jaws I have formed therein dovetail channels 8 for the reception of correspondingly-shaped toothed faces 9. The faces 9 of the clamping jaws 1 are engageable with the work 4. Nuts ID are threaded on the upper portions of the posts 5 for forcing the jaws 1 downwardly.

The jaws I further include protuberances II on their upper rear portions providing slightly inclined shoulders I 2. Screw jacks l3 are engageable beneath the shoulders i2 for forcing the jaws I against the work. In the embodiment shown, the screw jacks I3 include male and female members I4 and I5, respectively, the former being threaded, as at IS, the latter including a smooth bore H. The female member I5 further includes a substantially tapered lower end or base portion [8. A nut 19 is threaded on the portion I6 of the male member [4 and engaged with the upper end of the female member l5 for extending the jack.

Removable pins 20 are insertible selectively in the sockets 3 in the machine table I. Bearing against the pins 20 on the table I are bar 2|. The lower end portions l8 of the jacks I 3 are engageable with the bars 2|, which bars prevent said jacks from slipping on the table I It is thought that the manner of using the device will be readily apparent from a consideration of the foregoing. Briefly, the work 4 is placed at the desired location on the machine table I and the posts 5, with the jaws l thereon, are moved to a point adjacent thereto. The nuts ID are then adjusted to the desired position on the posts 5 and the jacks I3 are engaged beneath the shoulders I2, Of course, the pins 20 are inserted in the proper socket 3 in the table I and the bars 2| are placed thereagainst with the lower ends of the jacks engaged with said bars. The jacks I3 are then opened or extended for causing the jaws l to firmly clamp the work 4 therebetween, the toothed faces 9 biting into said work.

It is believed that the many advantages of a hold-down dog constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall Within the scope of the invention as claimed.

What is claimed is:

1. A hold-down dog of the character described comprising a plurality of posts for the reception of a piece of work therebetween, jaws slidably mounted on said posts, adjustable stop nuts for the jaws threadedly mounted on said posts, and means for forcing the jaws against the work.

2. A hold-down dog of the character described comp-rising a plurality of posts for the reception of a piece of work therebetween, jaws slidably mounted on said posts, said jaws including toothed faces engageable with the work, adjustable stop nuts for the jaws threadedly mounted on the posts, said jaws further including protuberances providing shoulders, and screw jacks engageable with said shoulders for forcing the jaws against the work.

3. A hold-down dog of the character described comprising, in combination, a machine table having a plurality of spaced, parallel substantially T-shaped grooves therein and further having a plurality of sockets therein, a plurality of threaded posts removably and adjustably mounted on the table and adapted to receive a piece of work therebetween on said table, said posts including heads on their lower ends operable in the grooves in the table, pins engageable selectively in the sockets, bars adapted to be mounted on the table and engaged with said pins, jaws slidably mounted on the posts and including shoulders, adjustable stop nuts for the jaws threaded on the posts above said jaws, and screw jacks engageable at one end with the bars on the table and at their other ends with the shoulders for forcing the jaws against the work.

4. A hold-down dog of the character described comprising, in combination, a machine table having a plurality of spaced parallel substantially T shaped grooves therein and further having a plurality of sockets therein, a plurality of threaded posts removably and adjustably mounted on the table and adapted to receive apiece of work therebetween on said table, said posts including heads on their lower ends operable in the grooves in the table, pins engageable selectively in the sockets, bars adapted to be mounted on the table and engaged with said pins, jaws slidably mounted on the posts and including shoulders, adjustable stop nuts for the jaws threaded on the posts above said jaws, and means supported by said bars for forcing the jaws against the Work.

JOHN L. DRAKE. 

